18-20 VL800/C/TK9 (’09-MODEL)
FAIL-SAFE FUNCTION
FI system is provided with fail-safe function to allow the engine to start and the motorcycle to run in a mini-
mum performance necessary even under malfunction condition.
The engine can start and can run even if the above signal is not received from each sensor. But, the engine
running condition is not complete, providing only emergency help (by fail-safe circuit). In this case, it is nec-
essary to bring the motorcycle to the workshop for complete repair.
When ECM does not receive all the ignition signals for one cylinder, the fuel cut function takes place for that
cylinder.
When the ignition signal of two cylinders or two injector signals are not received by ECM, the fail-safe func-
tion can not work and ignition or injection is stopped.
* ( ) ... For E-02, 19, 24, 33 * [ ] ... For E-03, 28
ITEM FAIL-SAFE MODE
STARTING
ABILITY
RUNNING
ABILITY
IAP sensor
(Front or Rear)
Intake air pressure is fixed to 550
mmHg.
“YES” “YES”
TP sensor The throttle opening is fixed at
approx. 3/4 open position.
Ignition timing is also fixed.
“YES” “YES”
ECT sensor Engine coolant temperature value is
fixed to 80 °C (176 °F).
“YES” “YES”
IAT sensor Intake air temperature value is fixed
to 40 °C (104 °F).
“YES” “YES”
Ignition signal #1 (main)
* [#1 Fuel-cut]
“YES “YES”
* (#1) & #2 cylinder(s) can run.
Ignition signal #1 (sub)
[For E-02, 19, 24, 33]
—
“YES” “YES”
* (#1) & #2 cylinder(s) can run.
Ignition signal #2 (main)
* [#2 Fuel-cut]
“YES” “YES”
* #1 & (#2) cylinder(s) can run.
Ignition signal #2 (sub)
[For E-02, 19, 24, 33]
—
“YES” “YES”
* #1 & (#2) cylinder(s) can run.
Injection signal #1
—
“YES” “YES”
#2 cylinder can run.
Injection signal #2
—
“YES” “YES”
#1 cylinder can run.
Secondary throttle valve
actuator
Secondary throttle valve is fixed to
full close position. When motor dis-
connection or lock occurs, power
from ECM is shut off.
“YES” “YES”
STP sensor Secondary throttle valve is fixed to
full close position.
“YES” “YES”
Gear position signal Gear position signal is fixed to 4th
gear.
“YES” “YES”
Heated oxygen sensor
(E-02, 19, 24, 33)
Feedback compensation is inhibited.
(Air/fuel ratio is fixed to normal.)
“YES” “YES”
PAIR control solenoid valve ECM stops controlling PAIR control
solenoid valve.
“YES” “YES”
ISC valve When motor disconnection or lock
occurs, power from ECM is shut off.
“YES” “YES”
EVAP system purge control
solenoid valve (E-33 only)
ECM stops controlling EVAP sys-
tem purge control solenoid valve.
“YES” “YES”
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